[common] Opposite of ‘test’. Refers to actual
real-world data or a program working with it. For example, the response to
“I think the record deleter is finished” might be “Is it
live yet?” or “Have you tried it out on live data?”
This usage usually carries the connotation that live data is more fragile
and must not be corrupted, or bad things will happen. So a more
appropriate response might be: “Well, make sure it works perfectly
before we throw live data at it.” The implication here is that
record deletion is something pretty significant, and a haywire
record-deleter running amok live would probably cause great harm.